| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Study on the Cell Growth Control of Thermoplastic vulcanizates (TPV) in Extrusion Process Combined with Supercritical Fluid System |
| 초록 | Ethylene-propylene rubber (EPDM) have been widely used in automotive industry as weatherstrips owing to their weather-ability, chemical resistance, dielectric property, and arrest dust and noises. In order to enhance mechanical property, sulfur was used ethylene-propylene main chain as cross-linker. Cross-linked EPDM applied to many kinds of automotive parts such as glass run, door side, trunk lid, and body side weatherstrips. However cross-linked EPDM do not recycled due to having network structure. Recently many researcher focus on thermoplastic vulcanizates (TPV) materials and also try to replace EPDM with TPV because of its reusability, and processibility. Research trends of weatherstrips for automotives in the world go for microcellular foam material using the supercritical system that make nitrogen gas to supercritical fluid. It is noted that supercritical fluid (SCF) state insert into injector part of extruder then well mixed to form single phase. SCF equipment make blowing agents such as CO2, N2 very effectively diffuse into polymer resin. In present study we try to find the relations between cell size and processing condition which are screw revolution per minute (RPM), temperatures, flow rate of nitrogen at SCF system. Scanning electron microscope (SEM) was used to analysis cell morphology. We measured some kinds of properties like compression set, density, non-flammability, and tensile strength properties of microcellular TPV sheet. The experimental results showed that cell number density per unit area decreased and density increase with increasing screw RPM. We find that the pressure drop at the end of dies play a strong role in microcelluar cell structure, and cell uniformity. |
| 저자 | 김백진1, 이효재2, 김성호2, 박주환2, 오정석3, 민병권3, 황태원3 |
| 소속 | 1한국생산기술(연), 2동일고무벨트, 3현대자동차 |
| 키워드 | microcellular foam; supercritical fluid (SCF); nitrogen; cell number density; extrusion process; thermoplastic vulcanizates (TPV) |
